Abstract: The media structures and attributes of crustmantle boundary in deep earth play an important role in the studies on sphere structure in the inner earth, especially in the lithosphere and deep dynamic processes. As the boundary between crust and upper mantle, it is closely related with the separation and regulation of deep matter and the movement and coupling of shallow and deep substance. The wavefield characteristics of wide angle and near vertical seismic reflections can be used to study the fine structure of crustmantle boundary, which has multistates structure with the thin layers of high velocity alternating low velocity and layer bundles. Near vertical and wide angle seismic reflections from the boundary have obvious and quite different dynamic features. The crustmantle boundary is a chemical interface composed of mainly with eclogite. A generalize model about the boundary is given in the last.

Key words: crustmantle boundary, thin layer bundle structure, travetime curve of amplitude, frequency response, chemical interface, generalized model